| 摘要 |
FIELD: mining.SUBSTANCE: invention is intended for engagement and transmission of torque and moment of revolution from cylindrical ring part with radial grooves to plate-like parts, including for attachment of plate cutters to crown bit. This invention consists in formation of fixed straight dovetail joint by clasp of cutter shank by outer and inner rings fitted in circular recesses over bit body OD and ID and fitting their part in bit body radial grooves so that cutter shank is pressed to radial groove leading wall. Thus, cutter shank proves fixed radially and axially by said outer and inner rings and clamped between deformed outer and inner rings on one side and, on opposite side, and leading wall of bit body radial groove. As a result cutter shank proves rigidly fixed in circular bit to make a press-fit connection.EFFECT: higher efficiency, increased load to crown bit at drilling hard rock.3 cl, 3 dwg |
